Jannane et al. (1989) made a simple numerical demonstration of a well known fact (Claerbout, 1985): that seismic data are sensitive to the large wavelengths of the velocity model and to the short wavelengths of the impedances. Taking a standard geometry (offsets between 250 m and 1750 m, dominant source frequency of 35 Hz, velocities from 1 km/s to 2.5 km/s, 1.5 s of signal), Jannane et al. conclude that standard seismic data are sensitive to impedance perturbations with wavelengths inside the 30 m-60 m bandwidth, and to velocity perturbations for wavelengths larger than 300 m.

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